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\( a^{b}\)

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the correct answer is 20W.USING P=I^2*R

making R subject of formula

R=I^2/P =

(220)^2/40=1210

now 1210 multiplied by the two lamps=1210*2=2420

THEN P=V^2*R =(220)^2/2420=20W JUST TRY IT

The answer is 20w,

Using R=V²/P

R=(220)²/40= 48400/40=1210

For the two lamp,

R= 1210×2 = 2420

P=V²/R

P= (220)²/2420

P=20w